以下哪种成分肾结石口服溶石药物是首选的治疗措施（）
A.碳酸钙
B.草酸钙
C.磷酸镁铵
D.胱氨酸
E.尿酸
参考答案：E
____ himself with necessary knowledge and skills, Tom went to the job market with much confidence.
A．Equipped
B．Equipping
C．Having equipped
D．Being equipped
现代药房管理的核心是保证用药的
A．安全
B．有效
C．经济
D．及时
E．合理
